Diagnosis system for variable valve controller

Details Diagnosis system for variable valve controller Diagnosis system for variable valve controller

2006-04-04

2006-04-04

Vo, Hieu T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

Reexamination Certificate

active

07024304

ABSTRACT:
A control mode of an intake valve lift controller is changed between a low-speed mode and a high-speed mode. Based on the control mode, an ignition timing is adjusted. When a knocking is detected by a knock sensor after the control mode is changed from the low-speed mode to the high-speed mode, it is determined that the intake valve lift controller has a malfunction in which the intake valve lift controller is stuck in the low-speed mode. When a combustion stability is lowered to a predetermined level after the control mode is changed from the high-speed mode to the low-speed mode, it is determined that the intake valve lift controller has a malfunction in which the intake valve lift controller is stuck in the high-speed mode.

REFERENCES:
patent: 2004/0173172 (2004-09-01), Harada et al.
patent: B2-2817055 (1988-08-01), None
patent: A-2-308911 (1990-12-01), None
patent: A-3-172516 (1991-07-01), None
patent: A-4-159426 (1992-06-01), None
patent: 5-52105 (1993-03-01), None
patent: B2-2571629 (1996-10-01), None

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